Merge tag 'trace-v5.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[linux/fpc-iii.git] / drivers / video / console / mdacon.c
blobef29b321967f07353f92714f78a58522e907ddf5
1 /*
2 * linux/drivers/video/mdacon.c -- Low level MDA based console driver
4 * (c) 1998 Andrew Apted <ajapted@netspace.net.au>
6 * including portions (c) 1995-1998 Patrick Caulfield.
8 * slight improvements (c) 2000 Edward Betts <edward@debian.org>
10 * This file is based on the VGA console driver (vgacon.c):
12 * Created 28 Sep 1997 by Geert Uytterhoeven
14 * Rewritten by Martin Mares <mj@ucw.cz>, July 1998
16 * and on the old console.c, vga.c and vesa_blank.c drivers:
18 * Copyright (C) 1991, 1992 Linus Torvalds
19 * 1995 Jay Estabrook
21 * This file is subject to the terms and conditions of the GNU General Public
22 * License. See the file COPYING in the main directory of this archive for
23 * more details.
25 * Changelog:
26 * Paul G. (03/2001) Fix mdacon= boot prompt to use __setup().
29 #include <linux/types.h>
30 #include <linux/fs.h>
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/console.h>
34 #include <linux/string.h>
35 #include <linux/kd.h>
36 #include <linux/vt_kern.h>
37 #include <linux/vt_buffer.h>
38 #include <linux/selection.h>
39 #include <linux/spinlock.h>
40 #include <linux/ioport.h>
41 #include <linux/delay.h>
42 #include <linux/init.h>
44 #include <asm/io.h>
45 #include <asm/vga.h>
47 static DEFINE_SPINLOCK(mda_lock);
49 /* description of the hardware layout */
51 static u16 *mda_vram_base; /* Base of video memory */
52 static unsigned long mda_vram_len; /* Size of video memory */
53 static unsigned int mda_num_columns; /* Number of text columns */
54 static unsigned int mda_num_lines; /* Number of text lines */
56 static unsigned int mda_index_port; /* Register select port */
57 static unsigned int mda_value_port; /* Register value port */
58 static unsigned int mda_mode_port; /* Mode control port */
59 static unsigned int mda_status_port; /* Status and Config port */
60 static unsigned int mda_gfx_port; /* Graphics control port */
62 /* current hardware state */
64 static int mda_cursor_loc=-1;
65 static int mda_cursor_size_from=-1;
66 static int mda_cursor_size_to=-1;
68 static enum { TYPE_MDA, TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } mda_type;
69 static char *mda_type_name;
71 /* console information */
73 static int mda_first_vc = 13;
74 static int mda_last_vc = 16;
76 static struct vc_data *mda_display_fg = NULL;
78 module_param(mda_first_vc, int, 0);
79 MODULE_PARM_DESC(mda_first_vc, "First virtual console. Default: 13");
80 module_param(mda_last_vc, int, 0);
81 MODULE_PARM_DESC(mda_last_vc, "Last virtual console. Default: 16");
83 /* MDA register values
86 #define MDA_CURSOR_BLINKING 0x00
87 #define MDA_CURSOR_OFF 0x20
88 #define MDA_CURSOR_SLOWBLINK 0x60
90 #define MDA_MODE_GRAPHICS 0x02
91 #define MDA_MODE_VIDEO_EN 0x08
92 #define MDA_MODE_BLINK_EN 0x20
93 #define MDA_MODE_GFX_PAGE1 0x80
95 #define MDA_STATUS_HSYNC 0x01
96 #define MDA_STATUS_VSYNC 0x80
97 #define MDA_STATUS_VIDEO 0x08
99 #define MDA_CONFIG_COL132 0x08
100 #define MDA_GFX_MODE_EN 0x01
101 #define MDA_GFX_PAGE_EN 0x02
105 * MDA could easily be classified as "pre-dinosaur hardware".
108 static void write_mda_b(unsigned int val, unsigned char reg)
110 unsigned long flags;
112 spin_lock_irqsave(&mda_lock, flags);
114 outb_p(reg, mda_index_port);
115 outb_p(val, mda_value_port);
117 spin_unlock_irqrestore(&mda_lock, flags);
120 static void write_mda_w(unsigned int val, unsigned char reg)
122 unsigned long flags;
124 spin_lock_irqsave(&mda_lock, flags);
126 outb_p(reg, mda_index_port); outb_p(val >> 8, mda_value_port);
127 outb_p(reg+1, mda_index_port); outb_p(val & 0xff, mda_value_port);
129 spin_unlock_irqrestore(&mda_lock, flags);
132 #ifdef TEST_MDA_B
133 static int test_mda_b(unsigned char val, unsigned char reg)
135 unsigned long flags;
137 spin_lock_irqsave(&mda_lock, flags);
139 outb_p(reg, mda_index_port);
140 outb (val, mda_value_port);
142 udelay(20); val = (inb_p(mda_value_port) == val);
144 spin_unlock_irqrestore(&mda_lock, flags);
145 return val;
147 #endif
149 static inline void mda_set_cursor(unsigned int location)
151 if (mda_cursor_loc == location)
152 return;
154 write_mda_w(location >> 1, 0x0e);
156 mda_cursor_loc = location;
159 static inline void mda_set_cursor_size(int from, int to)
161 if (mda_cursor_size_from==from && mda_cursor_size_to==to)
162 return;
164 if (from > to) {
165 write_mda_b(MDA_CURSOR_OFF, 0x0a); /* disable cursor */
166 } else {
167 write_mda_b(from, 0x0a); /* cursor start */
168 write_mda_b(to, 0x0b); /* cursor end */
171 mda_cursor_size_from = from;
172 mda_cursor_size_to = to;
176 #ifndef MODULE
177 static int __init mdacon_setup(char *str)
179 /* command line format: mdacon=<first>,<last> */
181 int ints[3];
183 str = get_options(str, ARRAY_SIZE(ints), ints);
185 if (ints[0] < 2)
186 return 0;
188 if (ints[1] < 1 || ints[1] > MAX_NR_CONSOLES ||
189 ints[2] < 1 || ints[2] > MAX_NR_CONSOLES)
190 return 0;
192 mda_first_vc = ints[1];
193 mda_last_vc = ints[2];
194 return 1;
197 __setup("mdacon=", mdacon_setup);
198 #endif
200 static int mda_detect(void)
202 int count=0;
203 u16 *p, p_save;
204 u16 *q, q_save;
206 /* do a memory check */
208 p = mda_vram_base;
209 q = mda_vram_base + 0x01000 / 2;
211 p_save = scr_readw(p);
212 q_save = scr_readw(q);
214 scr_writew(0xAA55, p);
215 if (scr_readw(p) == 0xAA55)
216 count++;
218 scr_writew(0x55AA, p);
219 if (scr_readw(p) == 0x55AA)
220 count++;
222 scr_writew(p_save, p);
224 if (count != 2) {
225 return 0;
228 /* check if we have 4K or 8K */
230 scr_writew(0xA55A, q);
231 scr_writew(0x0000, p);
232 if (scr_readw(q) == 0xA55A)
233 count++;
235 scr_writew(0x5AA5, q);
236 scr_writew(0x0000, p);
237 if (scr_readw(q) == 0x5AA5)
238 count++;
240 scr_writew(p_save, p);
241 scr_writew(q_save, q);
243 if (count == 4) {
244 mda_vram_len = 0x02000;
247 /* Ok, there is definitely a card registering at the correct
248 * memory location, so now we do an I/O port test.
251 #ifdef TEST_MDA_B
252 /* Edward: These two mess `tests' mess up my cursor on bootup */
254 /* cursor low register */
255 if (!test_mda_b(0x66, 0x0f))
256 return 0;
258 /* cursor low register */
259 if (!test_mda_b(0x99, 0x0f))
260 return 0;
261 #endif
263 /* See if the card is a Hercules, by checking whether the vsync
264 * bit of the status register is changing. This test lasts for
265 * approximately 1/10th of a second.
268 p_save = q_save = inb_p(mda_status_port) & MDA_STATUS_VSYNC;
270 for (count = 0; count < 50000 && p_save == q_save; count++) {
271 q_save = inb(mda_status_port) & MDA_STATUS_VSYNC;
272 udelay(2);
275 if (p_save != q_save) {
276 switch (inb_p(mda_status_port) & 0x70) {
277 case 0x10:
278 mda_type = TYPE_HERCPLUS;
279 mda_type_name = "HerculesPlus";
280 break;
281 case 0x50:
282 mda_type = TYPE_HERCCOLOR;
283 mda_type_name = "HerculesColor";
284 break;
285 default:
286 mda_type = TYPE_HERC;
287 mda_type_name = "Hercules";
288 break;
292 return 1;
295 static void mda_initialize(void)
297 write_mda_b(97, 0x00); /* horizontal total */
298 write_mda_b(80, 0x01); /* horizontal displayed */
299 write_mda_b(82, 0x02); /* horizontal sync pos */
300 write_mda_b(15, 0x03); /* horizontal sync width */
302 write_mda_b(25, 0x04); /* vertical total */
303 write_mda_b(6, 0x05); /* vertical total adjust */
304 write_mda_b(25, 0x06); /* vertical displayed */
305 write_mda_b(25, 0x07); /* vertical sync pos */
307 write_mda_b(2, 0x08); /* interlace mode */
308 write_mda_b(13, 0x09); /* maximum scanline */
309 write_mda_b(12, 0x0a); /* cursor start */
310 write_mda_b(13, 0x0b); /* cursor end */
312 write_mda_w(0x0000, 0x0c); /* start address */
313 write_mda_w(0x0000, 0x0e); /* cursor location */
315 outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN, mda_mode_port);
316 outb_p(0x00, mda_status_port);
317 outb_p(0x00, mda_gfx_port);
320 static const char *mdacon_startup(void)
322 mda_num_columns = 80;
323 mda_num_lines = 25;
325 mda_vram_len = 0x01000;
326 mda_vram_base = (u16 *)VGA_MAP_MEM(0xb0000, mda_vram_len);
328 mda_index_port = 0x3b4;
329 mda_value_port = 0x3b5;
330 mda_mode_port = 0x3b8;
331 mda_status_port = 0x3ba;
332 mda_gfx_port = 0x3bf;
334 mda_type = TYPE_MDA;
335 mda_type_name = "MDA";
337 if (! mda_detect()) {
338 printk("mdacon: MDA card not detected.\n");
339 return NULL;
342 if (mda_type != TYPE_MDA) {
343 mda_initialize();
346 /* cursor looks ugly during boot-up, so turn it off */
347 mda_set_cursor(mda_vram_len - 1);
349 printk("mdacon: %s with %ldK of memory detected.\n",
350 mda_type_name, mda_vram_len/1024);
352 return "MDA-2";
355 static void mdacon_init(struct vc_data *c, int init)
357 c->vc_complement_mask = 0x0800; /* reverse video */
358 c->vc_display_fg = &mda_display_fg;
360 if (init) {
361 c->vc_cols = mda_num_columns;
362 c->vc_rows = mda_num_lines;
363 } else
364 vc_resize(c, mda_num_columns, mda_num_lines);
366 /* make the first MDA console visible */
368 if (mda_display_fg == NULL)
369 mda_display_fg = c;
372 static void mdacon_deinit(struct vc_data *c)
374 /* con_set_default_unimap(c->vc_num); */
376 if (mda_display_fg == c)
377 mda_display_fg = NULL;
380 static inline u16 mda_convert_attr(u16 ch)
382 u16 attr = 0x0700;
384 /* Underline and reverse-video are mutually exclusive on MDA.
385 * Since reverse-video is used for cursors and selected areas,
386 * it takes precedence.
389 if (ch & 0x0800) attr = 0x7000; /* reverse */
390 else if (ch & 0x0400) attr = 0x0100; /* underline */
392 return ((ch & 0x0200) << 2) | /* intensity */
393 (ch & 0x8000) | /* blink */
394 (ch & 0x00ff) | attr;
397 static u8 mdacon_build_attr(struct vc_data *c, u8 color,
398 enum vc_intensity intensity,
399 bool blink, bool underline, bool reverse,
400 bool italic)
402 /* The attribute is just a bit vector:
404 * Bit 0..1 : intensity (0..2)
405 * Bit 2 : underline
406 * Bit 3 : reverse
407 * Bit 7 : blink
410 return (intensity & VCI_MASK) |
411 (underline << 2) |
412 (reverse << 3) |
413 (italic << 4) |
414 (blink << 7);
417 static void mdacon_invert_region(struct vc_data *c, u16 *p, int count)
419 for (; count > 0; count--) {
420 scr_writew(scr_readw(p) ^ 0x0800, p);
421 p++;
425 static inline u16 *mda_addr(unsigned int x, unsigned int y)
427 return mda_vram_base + y * mda_num_columns + x;
430 static void mdacon_putc(struct vc_data *c, int ch, int y, int x)
432 scr_writew(mda_convert_attr(ch), mda_addr(x, y));
435 static void mdacon_putcs(struct vc_data *c, const unsigned short *s,
436 int count, int y, int x)
438 u16 *dest = mda_addr(x, y);
440 for (; count > 0; count--) {
441 scr_writew(mda_convert_attr(scr_readw(s++)), dest++);
445 static void mdacon_clear(struct vc_data *c, int y, int x,
446 int height, int width)
448 u16 *dest = mda_addr(x, y);
449 u16 eattr = mda_convert_attr(c->vc_video_erase_char);
451 if (width <= 0 || height <= 0)
452 return;
454 if (x==0 && width==mda_num_columns) {
455 scr_memsetw(dest, eattr, height*width*2);
456 } else {
457 for (; height > 0; height--, dest+=mda_num_columns)
458 scr_memsetw(dest, eattr, width*2);
462 static int mdacon_switch(struct vc_data *c)
464 return 1; /* redrawing needed */
467 static int mdacon_blank(struct vc_data *c, int blank, int mode_switch)
469 if (mda_type == TYPE_MDA) {
470 if (blank)
471 scr_memsetw(mda_vram_base,
472 mda_convert_attr(c->vc_video_erase_char),
473 c->vc_screenbuf_size);
474 /* Tell console.c that it has to restore the screen itself */
475 return 1;
476 } else {
477 if (blank)
478 outb_p(0x00, mda_mode_port); /* disable video */
479 else
480 outb_p(MDA_MODE_VIDEO_EN | MDA_MODE_BLINK_EN,
481 mda_mode_port);
482 return 0;
486 static void mdacon_cursor(struct vc_data *c, int mode)
488 if (mode == CM_ERASE) {
489 mda_set_cursor(mda_vram_len - 1);
490 return;
493 mda_set_cursor(c->state.y * mda_num_columns * 2 + c->state.x * 2);
495 switch (CUR_SIZE(c->vc_cursor_type)) {
497 case CUR_LOWER_THIRD: mda_set_cursor_size(10, 13); break;
498 case CUR_LOWER_HALF: mda_set_cursor_size(7, 13); break;
499 case CUR_TWO_THIRDS: mda_set_cursor_size(4, 13); break;
500 case CUR_BLOCK: mda_set_cursor_size(1, 13); break;
501 case CUR_NONE: mda_set_cursor_size(14, 13); break;
502 default: mda_set_cursor_size(12, 13); break;
506 static bool mdacon_scroll(struct vc_data *c, unsigned int t, unsigned int b,
507 enum con_scroll dir, unsigned int lines)
509 u16 eattr = mda_convert_attr(c->vc_video_erase_char);
511 if (!lines)
512 return false;
514 if (lines > c->vc_rows) /* maximum realistic size */
515 lines = c->vc_rows;
517 switch (dir) {
519 case SM_UP:
520 scr_memmovew(mda_addr(0, t), mda_addr(0, t + lines),
521 (b-t-lines)*mda_num_columns*2);
522 scr_memsetw(mda_addr(0, b - lines), eattr,
523 lines*mda_num_columns*2);
524 break;
526 case SM_DOWN:
527 scr_memmovew(mda_addr(0, t + lines), mda_addr(0, t),
528 (b-t-lines)*mda_num_columns*2);
529 scr_memsetw(mda_addr(0, t), eattr, lines*mda_num_columns*2);
530 break;
533 return false;
538 * The console `switch' structure for the MDA based console
541 static const struct consw mda_con = {
542 .owner = THIS_MODULE,
543 .con_startup = mdacon_startup,
544 .con_init = mdacon_init,
545 .con_deinit = mdacon_deinit,
546 .con_clear = mdacon_clear,
547 .con_putc = mdacon_putc,
548 .con_putcs = mdacon_putcs,
549 .con_cursor = mdacon_cursor,
550 .con_scroll = mdacon_scroll,
551 .con_switch = mdacon_switch,
552 .con_blank = mdacon_blank,
553 .con_build_attr = mdacon_build_attr,
554 .con_invert_region = mdacon_invert_region,
557 int __init mda_console_init(void)
559 int err;
561 if (mda_first_vc > mda_last_vc)
562 return 1;
563 console_lock();
564 err = do_take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0);
565 console_unlock();
566 return err;
569 static void __exit mda_console_exit(void)
571 give_up_console(&mda_con);
574 module_init(mda_console_init);
575 module_exit(mda_console_exit);
577 MODULE_LICENSE("GPL");